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Stock-Based Compensation Plans (Other Information Pertaining to RSUs) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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May 31, 2024 | May 31, 2023 | May 31, 2022
Time-Based RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant-date fair value per share |  | $ 114.95 | [1] | $ 127.75 | $ 109.81
Weighted-average remaining vesting period (years) | [2] | 1 year 4 months 24 days |  | 1 year 6 months | 1 year 6 months
Total intrinsic value of RSUs vested |  | $ 55.9 |  | $ 58.2 | $ 54.7
Aggregate intrinsic value of nonvested RSUs | [3] | 152.5 |  | 141.8 | 165.2
Total grant-date fair value of RSUs vested |  | $ 41.2 |  | $ 32.7 | $ 30.0
Performance-Based RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant-date fair value per share |  | $ 114.23 | [1] | $ 108.31 | $ 103.59
Weighted-average remaining vesting period (years) | [2] | 1 year 1 month 6 days |  | 1 year 9 months 18 days | 1 year
Total intrinsic value of RSUs vested |  | $ 0.4 |  | $ 7.8 |
Aggregate intrinsic value of nonvested RSUs | [3] | 30.8 |  | 15.7 | $ 14.7
Total grant-date fair value of RSUs vested |  | $ 0.4 |  | $ 5.4 |
[1] | For performance-based RSUs, granted number assumes achievement of performance goals at target. Actual number of shares to be earned may differ from this amount.
[2] | Weighting is based on the number of unvested share units vesting in each future vesting tranche.
[3] | Based on the market price of the underlying common stock as of May 31, 2024, 2023 and 2022.

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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